Thank you for viewing. BPA-Free Glass Water Bottle with Direct Drinking, 500ml, with Time Markers | For Adults and Children, Suitable for Hiking/Camping/Gym | Leak-Proof Design 【Water Bottle with Time Markers】The surface of this glass water bottle is equipped with a time scale, allowing you to constantly monitor your daily water intake and drink water scientifically. 【Healthy Material】This premium portable water bottle is made of food-grade, environmentally friendly glass, so you don't have to worry about harmful chemicals. 【Wide Range of Uses】Perfect summer fitness portable water bottle for the gym, outdoor activities, camping, cycling, and home kitchens. Not only is it easy to monitor your daily water intake, but it can also be used as a water bottle for everyday drinks such as milk, lemon tea, and coffee. Comes with a cleaning sponge. I opened it with the intention of using it, but I never had the opportunity to use it. Please understand.